/**
**********************************************************************
* @file     main.c
* @brief    对文件的简要说明
* @details  对文件的详细说明
* @author   jcai
* @date     2022-05-06 14:55:27
* @copyright Copyright &copy; 2022 wy1107412334@163.com All rights reserved
* @version  v0.0.1
*
* \n Email:  wy1107412334@163.com
* \n Blog:   None
* \n Github: https://github.com/wy1107412334
* \n Gitee:  https://gitee.com/git.git1107412334.com
*
**********************************************************************
* @note
* None.
**********************************************************************
* @attention
* None.
**********************************************************************
@verbatim
@endverbatim
**********************************************************************
* @par 历史记录
* 1. v0.0.1: jcai, 2022-05-06 14:55:27
*   - 首次编写
*
*<center>Copyright &copy; 2022 wy1107412334@163.com All rights reserved</center>
**********************************************************************
*/

/* 头文件导入区 --------------------------------------------------- */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <SDL/SDL.h>
#include <SDL/SDL_video.h>
#include <SDL/SDL_image.h>
#include <SDL/SDL_thread.h>
#include <SDL/SDL_mutex.h>
#include <SDL/SDL_ttf.h>
#include <SDL/SDL_events.h>
#include <SDL/SDL_timer.h>
#include <SDL/SDL_keysym.h>



// 窗口属性
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

// 将要使用的表面
SDL_Surface *background = NULL;
SDL_Surface *screen = NULL;
SDL_Surface *text[5] = {NULL, NULL, NULL, NULL, NULL};

// 事件结构体
SDL_Event event;

// 线程的句柄
SDL_Thread *threadA = NULL;
SDL_Thread *threadB = NULL;

// 信号量
SDL_sem *videoLock = NULL;

// 将要用到的字体
TTF_Font *font = NULL;
// 字体的颜色
SDL_Color textColor = {0x77, 0x77, 0x77};

// 退出标志
int quit = 0;



SDL_Surface *load_image(const char *file)
{
    SDL_Surface *loadedImage = NULL;
    SDL_Surface *optimizedImage = NULL;

    // 通过 SDL_imag 模块加载图片
    loadedImage = IMG_Load(file);
    if (!loadedImage)   return NULL;

    optimizedImage = SDL_DisplayFormat(loadedImage);
    SDL_FreeSurface(loadedImage);
    if (optimizedImage)
    {
        // 映射关键色
        uint32_t keycolor = SDL_MapRGB(optimizedImage->format, 0, 0xff, 0xff);
        // 将所有颜色为 RGB(0x00, 0xff, 0xff) 的像素设为透明
        SDL_SetColorKey(optimizedImage, SDL_SRCCOLORKEY, keycolor);
    }

    return optimizedImage;
}

void apply_surface(int x, int y, SDL_Surface *src, SDL_Surface *dst,
                   const SDL_Rect *clip)
{
    SDL_Rect offset;

    offset.x = x;
    offset.y = y;

    SDL_BlitSurface(src, (SDL_Rect *)clip, dst, &offset);
}

int init()
{
    if (SDL_Init(SDL_INIT_EVERYTHING) == -1)
        return -1;

    screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP,
                              SDL_SWSURFACE);
    if (!screen)
    {
        SDL_Quit();
        return -2;
    }

    // 初始化 SDL_ttf 库
    if (TTF_Init() == -1)
    {
        SDL_Quit();
        return -3;
    }

    SDL_WM_SetCaption("Testing Threads", NULL );

    // 创建信号量。仅允许1个线程通过
    videoLock = SDL_CreateSemaphore( 1 );

    // 给窗口背景填充白色
    SDL_FillRect(screen, &screen->clip_rect,
                 SDL_MapRGB(screen->format, 0xff, 0xff, 0xff));

    return 0;
}

int load_files()
{
    // 加载背景图片
    background = load_image("background.png");
    if (!background)    return -1;

    // 打开字体
    font = TTF_OpenFont("lazy.ttf", 28);
    if (!font)
    {
        SDL_FreeSurface(background);
        return -2;
    }

    // 渲染文本
    text[ 0 ] = TTF_RenderText_Solid( font, "One", textColor );
    text[ 1 ] = TTF_RenderText_Solid( font, "Two", textColor );
    text[ 2 ] = TTF_RenderText_Solid( font, "Three", textColor );
    text[ 3 ] = TTF_RenderText_Solid( font, "Four", textColor );
    text[ 4 ] = TTF_RenderText_Solid( font, "Five", textColor );

    return 0;
}

void clean_up()
{
    int t;
    int status;

    printf("主线程等待子线程退出...\n");
    // 等待子线程退出
    if (threadA)
    {
        SDL_WaitThread(threadA, &status);
        printf("子线程A的退出状态为： %d\n", status);
    }
    if (threadB)
    {
        SDL_WaitThread(threadB, &status);
        printf("子线程B的退出状态为： %d\n", status);
    }

    // 销毁信号量
    SDL_DestroySemaphore( videoLock );

    SDL_FreeSurface(background);
    // 释放字体
    for(t = 0; t < 5; t++)
    {
        SDL_FreeSurface( text[ t ] );
    }

    // 关闭用过的字体
    TTF_CloseFont(font);
    // 退出SDL_ttf库
    TTF_Quit();

    SDL_Quit();
}

void show_surface(int x, int y, SDL_Surface *src)
{
    SDL_Rect offset;

    // 上锁
    SDL_SemWait(videoLock);

    offset.x = x;
    offset.y = y;
    SDL_BlitSurface(src, NULL, screen, &offset);

    // 解锁
    SDL_SemPost(videoLock);
}
int blitter_a(void *data)
{
    while (!quit)
    {
        //Y offset
        int y = 10;
        int b;

        //Go through the surface
        for(b = 0; b < 5; b++ )
        {
            //Wait
            SDL_Delay( 200 );

            //Show surface
            show_surface(((SCREEN_WIDTH / 2) - text[b]->w) / 2, y, text[b]);

            //Move down
            y += 100;
        }

        SDL_Delay(1010);
    }

    return 0;
}

int blitter_b(void *data)
{
    while (!quit)
    {
        //Y offset
        int y = 10;
        int b;

        //Go through the surface
        for(b = 0; b < 5; b++ )
        {
            //Wait
            SDL_Delay( 201 );

            //Show surface
            show_surface((SCREEN_WIDTH / 2) + (((SCREEN_WIDTH / 2) -
                            text[b]->w ) / 2 ), y, text[ b ] );

            //Move down
            y += 100;
        }

        SDL_Delay(1000);
    }

    return 0;
}




/**
**********************************************************************
* @brief    简要说明
* @details  详细说明
* @param    none
* @param[in]     a: 该参数用于输入
* @param[in,out] b: 该参数用于输入和输出
* @param[out]    c: 该参数用于输出
* @retval  none
* @retval  0 函数成功
* @retval  1 函数失败
* @return  返回0成功；否则失败
* @note    none
*/
int main(int argc, char *argv[])
{
    int i = 0;

    if (init() != 0)
    {
        fprintf(stderr, "SDL初始化失败\n");
        return EXIT_FAILURE;
    }
    if (load_files() != 0)
    {
        fprintf(stderr, "SDL加载 background.png 失败\n");
        return EXIT_FAILURE;
    }

    // 创建线程
    threadA = SDL_CreateThread( blitter_a, NULL );
    threadB = SDL_CreateThread( blitter_b, NULL );

    while (!quit)
    {
        // 处理SDL的事件
        while (SDL_PollEvent(&event))
        {
            // 如果用户点击了窗口右上角的关闭按钮
            if (event.type == SDL_QUIT)
            {
                quit = 1;
                break;
            }
        }

        // 显示背景图
        if ((i++ % 10) == 0) show_surface( 0, 0, background );

        // 更新窗口
        if (SDL_Flip(screen) == -1)
        {
            fprintf(stderr, "SDL更新窗口失败\n");
            return EXIT_FAILURE;
        }

        SDL_Delay(200);
    }

    clean_up();

    return 0;
}


/***  Copyright (C) 2022 wy1107412334@163.com All rights reserved ***/
/****************************** END OF FILE *************************/

